Let's roll up our sleeves and solve this. We have 867 and we're going to multiply it by 331, essentially adding 867 to itself 331 times.
Step 1: 0 + 867 = 867
Step 2: 867 + 867 = 1734
Step 3: 1734 + 867 = 2601
Step 4: 2601 + 867 = 3468
Step 5: 3468 + 867 = 4335
Step 6: 4335 + 867 = 5202
Step 7: 5202 + 867 = 6069
Step 8: 6069 + 867 = 6936
Step 9: 6936 + 867 = 7803
Step 10: 7803 + 867 = 8670
Step 11: 8670 + 867 = 9537
Step 12: 9537 + 867 = 10404
Step 13: 10404 + 867 = 11271
Step 14: 11271 + 867 = 12138
Step 15: 12138 + 867 = 13005
Step 16: 13005 + 867 = 13872
Step 17: 13872 + 867 = 14739
Step 18: 14739 + 867 = 15606
Step 19: 15606 + 867 = 16473
Step 20: 16473 + 867 = 17340
Step 21: 17340 + 867 = 18207
Step 22: 18207 + 867 = 19074
Step 23: 19074 + 867 = 19941
Step 24: 19941 + 867 = 20808
Step 25: 20808 + 867 = 21675
Step 26: 21675 + 867 = 22542
Step 27: 22542 + 867 = 23409
Step 28: 23409 + 867 = 24276
Step 29: 24276 + 867 = 25143
Step 30: 25143 + 867 = 26010
Step 31: 26010 + 867 = 26877
Step 32: 26877 + 867 = 27744
Step 33: 27744 + 867 = 28611
Step 34: 28611 + 867 = 29478
Step 35: 29478 + 867 = 30345
Step 36: 30345 + 867 = 31212
Step 37: 31212 + 867 = 32079
Step 38: 32079 + 867 = 32946
Step 39: 32946 + 867 = 33813
Step 40: 33813 + 867 = 34680
Step 41: 34680 + 867 = 35547
Step 42: 35547 + 867 = 36414
Step 43: 36414 + 867 = 37281
Step 44: 37281 + 867 = 38148
Step 45: 38148 + 867 = 39015
Step 46: 39015 + 867 = 39882
Step 47: 39882 + 867 = 40749
Step 48: 40749 + 867 = 41616
Step 49: 41616 + 867 = 42483
Step 50: 42483 + 867 = 43350
Step 51: 43350 + 867 = 44217
Step 52: 44217 + 867 = 45084
Step 53: 45084 + 867 = 45951
Step 54: 45951 + 867 = 46818
Step 55: 46818 + 867 = 47685
Step 56: 47685 + 867 = 48552
Step 57: 48552 + 867 = 49419
Step 58: 49419 + 867 = 50286
Step 59: 50286 + 867 = 51153
Step 60: 51153 + 867 = 52020
Step 61: 52020 + 867 = 52887
Step 62: 52887 + 867 = 53754
Step 63: 53754 + 867 = 54621
Step 64: 54621 + 867 = 55488
Step 65: 55488 + 867 = 56355
Step 66: 56355 + 867 = 57222
Step 67: 57222 + 867 = 58089
Step 68: 58089 + 867 = 58956
Step 69: 58956 + 867 = 59823
Step 70: 59823 + 867 = 60690
Step 71: 60690 + 867 = 61557
Step 72: 61557 + 867 = 62424
Step 73: 62424 + 867 = 63291
Step 74: 63291 + 867 = 64158
Step 75: 64158 + 867 = 65025
Step 76: 65025 + 867 = 65892
Step 77: 65892 + 867 = 66759
Step 78: 66759 + 867 = 67626
Step 79: 67626 + 867 = 68493
Step 80: 68493 + 867 = 69360
Step 81: 69360 + 867 = 70227
Step 82: 70227 + 867 = 71094
Step 83: 71094 + 867 = 71961
Step 84: 71961 + 867 = 72828
Step 85: 72828 + 867 = 73695
Step 86: 73695 + 867 = 74562
Step 87: 74562 + 867 = 75429
Step 88: 75429 + 867 = 76296
Step 89: 76296 + 867 = 77163
Step 90: 77163 + 867 = 78030
Step 91: 78030 + 867 = 78897
Step 92: 78897 + 867 = 79764
Step 93: 79764 + 867 = 80631
Step 94: 80631 + 867 = 81498
Step 95: 81498 + 867 = 82365
Step 96: 82365 + 867 = 83232
Step 97: 83232 + 867 = 84099
Step 98: 84099 + 867 = 84966
Step 99: 84966 + 867 = 85833
Step 100: 85833 + 867 = 86700
Step 101: 86700 + 867 = 87567
Step 102: 87567 + 867 = 88434
Step 103: 88434 + 867 = 89301
Step 104: 89301 + 867 = 90168
Step 105: 90168 + 867 = 91035
Step 106: 91035 + 867 = 91902
Step 107: 91902 + 867 = 92769
Step 108: 92769 + 867 = 93636
Step 109: 93636 + 867 = 94503
Step 110: 94503 + 867 = 95370
Step 111: 95370 + 867 = 96237
Step 112: 96237 + 867 = 97104
Step 113: 97104 + 867 = 97971
Step 114: 97971 + 867 = 98838
Step 115: 98838 + 867 = 99705
Step 116: 99705 + 867 = 100572
Step 117: 100572 + 867 = 101439
Step 118: 101439 + 867 = 102306
Step 119: 102306 + 867 = 103173
Step 120: 103173 + 867 = 104040
Step 121: 104040 + 867 = 104907
Step 122: 104907 + 867 = 105774
Step 123: 105774 + 867 = 106641
Step 124: 106641 + 867 = 107508
Step 125: 107508 + 867 = 108375
Step 126: 108375 + 867 = 109242
Step 127: 109242 + 867 = 110109
Step 128: 110109 + 867 = 110976
Step 129: 110976 + 867 = 111843
Step 130: 111843 + 867 = 112710
Step 131: 112710 + 867 = 113577
Step 132: 113577 + 867 = 114444
Step 133: 114444 + 867 = 115311
Step 134: 115311 + 867 = 116178
Step 135: 116178 + 867 = 117045
Step 136: 117045 + 867 = 117912
Step 137: 117912 + 867 = 118779
Step 138: 118779 + 867 = 119646
Step 139: 119646 + 867 = 120513
Step 140: 120513 + 867 = 121380
Step 141: 121380 + 867 = 122247
Step 142: 122247 + 867 = 123114
Step 143: 123114 + 867 = 123981
Step 144: 123981 + 867 = 124848
Step 145: 124848 + 867 = 125715
Step 146: 125715 + 867 = 126582
Step 147: 126582 + 867 = 127449
Step 148: 127449 + 867 = 128316
Step 149: 128316 + 867 = 129183
Step 150: 129183 + 867 = 130050
Step 151: 130050 + 867 = 130917
Step 152: 130917 + 867 = 131784
Step 153: 131784 + 867 = 132651
Step 154: 132651 + 867 = 133518
Step 155: 133518 + 867 = 134385
Step 156: 134385 + 867 = 135252
Step 157: 135252 + 867 = 136119
Step 158: 136119 + 867 = 136986
Step 159: 136986 + 867 = 137853
Step 160: 137853 + 867 = 138720
Step 161: 138720 + 867 = 139587
Step 162: 139587 + 867 = 140454
Step 163: 140454 + 867 = 141321
Step 164: 141321 + 867 = 142188
Step 165: 142188 + 867 = 143055
Step 166: 143055 + 867 = 143922
Step 167: 143922 + 867 = 144789
Step 168: 144789 + 867 = 145656
Step 169: 145656 + 867 = 146523
Step 170: 146523 + 867 = 147390
Step 171: 147390 + 867 = 148257
Step 172: 148257 + 867 = 149124
Step 173: 149124 + 867 = 149991
Step 174: 149991 + 867 = 150858
Step 175: 150858 + 867 = 151725
Step 176: 151725 + 867 = 152592
Step 177: 152592 + 867 = 153459
Step 178: 153459 + 867 = 154326
Step 179: 154326 + 867 = 155193
Step 180: 155193 + 867 = 156060
Step 181: 156060 + 867 = 156927
Step 182: 156927 + 867 = 157794
Step 183: 157794 + 867 = 158661
Step 184: 158661 + 867 = 159528
Step 185: 159528 + 867 = 160395
Step 186: 160395 + 867 = 161262
Step 187: 161262 + 867 = 162129
Step 188: 162129 + 867 = 162996
Step 189: 162996 + 867 = 163863
Step 190: 163863 + 867 = 164730
Step 191: 164730 + 867 = 165597
Step 192: 165597 + 867 = 166464
Step 193: 166464 + 867 = 167331
Step 194: 167331 + 867 = 168198
Step 195: 168198 + 867 = 169065
Step 196: 169065 + 867 = 169932
Step 197: 169932 + 867 = 170799
Step 198: 170799 + 867 = 171666
Step 199: 171666 + 867 = 172533
Step 200: 172533 + 867 = 173400
Step 201: 173400 + 867 = 174267
Step 202: 174267 + 867 = 175134
Step 203: 175134 + 867 = 176001
Step 204: 176001 + 867 = 176868
Step 205: 176868 + 867 = 177735
Step 206: 177735 + 867 = 178602
Step 207: 178602 + 867 = 179469
Step 208: 179469 + 867 = 180336
Step 209: 180336 + 867 = 181203
Step 210: 181203 + 867 = 182070
Step 211: 182070 + 867 = 182937
Step 212: 182937 + 867 = 183804
Step 213: 183804 + 867 = 184671
Step 214: 184671 + 867 = 185538
Step 215: 185538 + 867 = 186405
Step 216: 186405 + 867 = 187272
Step 217: 187272 + 867 = 188139
Step 218: 188139 + 867 = 189006
Step 219: 189006 + 867 = 189873
Step 220: 189873 + 867 = 190740
Step 221: 190740 + 867 = 191607
Step 222: 191607 + 867 = 192474
Step 223: 192474 + 867 = 193341
Step 224: 193341 + 867 = 194208
Step 225: 194208 + 867 = 195075
Step 226: 195075 + 867 = 195942
Step 227: 195942 + 867 = 196809
Step 228: 196809 + 867 = 197676
Step 229: 197676 + 867 = 198543
Step 230: 198543 + 867 = 199410
Step 231: 199410 + 867 = 200277
Step 232: 200277 + 867 = 201144
Step 233: 201144 + 867 = 202011
Step 234: 202011 + 867 = 202878
Step 235: 202878 + 867 = 203745
Step 236: 203745 + 867 = 204612
Step 237: 204612 + 867 = 205479
Step 238: 205479 + 867 = 206346
Step 239: 206346 + 867 = 207213
Step 240: 207213 + 867 = 208080
Step 241: 208080 + 867 = 208947
Step 242: 208947 + 867 = 209814
Step 243: 209814 + 867 = 210681
Step 244: 210681 + 867 = 211548
Step 245: 211548 + 867 = 212415
Step 246: 212415 + 867 = 213282
Step 247: 213282 + 867 = 214149
Step 248: 214149 + 867 = 215016
Step 249: 215016 + 867 = 215883
Step 250: 215883 + 867 = 216750
Step 251: 216750 + 867 = 217617
Step 252: 217617 + 867 = 218484
Step 253: 218484 + 867 = 219351
Step 254: 219351 + 867 = 220218
Step 255: 220218 + 867 = 221085
Step 256: 221085 + 867 = 221952
Step 257: 221952 + 867 = 222819
Step 258: 222819 + 867 = 223686
Step 259: 223686 + 867 = 224553
Step 260: 224553 + 867 = 225420
Step 261: 225420 + 867 = 226287
Step 262: 226287 + 867 = 227154
Step 263: 227154 + 867 = 228021
Step 264: 228021 + 867 = 228888
Step 265: 228888 + 867 = 229755
Step 266: 229755 + 867 = 230622
Step 267: 230622 + 867 = 231489
Step 268: 231489 + 867 = 232356
Step 269: 232356 + 867 = 233223
Step 270: 233223 + 867 = 234090
Step 271: 234090 + 867 = 234957
Step 272: 234957 + 867 = 235824
Step 273: 235824 + 867 = 236691
Step 274: 236691 + 867 = 237558
Step 275: 237558 + 867 = 238425
Step 276: 238425 + 867 = 239292
Step 277: 239292 + 867 = 240159
Step 278: 240159 + 867 = 241026
Step 279: 241026 + 867 = 241893
Step 280: 241893 + 867 = 242760
Step 281: 242760 + 867 = 243627
Step 282: 243627 + 867 = 244494
Step 283: 244494 + 867 = 245361
Step 284: 245361 + 867 = 246228
Step 285: 246228 + 867 = 247095
Step 286: 247095 + 867 = 247962
Step 287: 247962 + 867 = 248829
Step 288: 248829 + 867 = 249696
Step 289: 249696 + 867 = 250563
Step 290: 250563 + 867 = 251430
Step 291: 251430 + 867 = 252297
Step 292: 252297 + 867 = 253164
Step 293: 253164 + 867 = 254031
Step 294: 254031 + 867 = 254898
Step 295: 254898 + 867 = 255765
Step 296: 255765 + 867 = 256632
Step 297: 256632 + 867 = 257499
Step 298: 257499 + 867 = 258366
Step 299: 258366 + 867 = 259233
Step 300: 259233 + 867 = 260100
Step 301: 260100 + 867 = 260967
Step 302: 260967 + 867 = 261834
Step 303: 261834 + 867 = 262701
Step 304: 262701 + 867 = 263568
Step 305: 263568 + 867 = 264435
Step 306: 264435 + 867 = 265302
Step 307: 265302 + 867 = 266169
Step 308: 266169 + 867 = 267036
Step 309: 267036 + 867 = 267903
Step 310: 267903 + 867 = 268770
Step 311: 268770 + 867 = 269637
Step 312: 269637 + 867 = 270504
Step 313: 270504 + 867 = 271371
Step 314: 271371 + 867 = 272238
Step 315: 272238 + 867 = 273105
Step 316: 273105 + 867 = 273972
Step 317: 273972 + 867 = 274839
Step 318: 274839 + 867 = 275706
Step 319: 275706 + 867 = 276573
Step 320: 276573 + 867 = 277440
Step 321: 277440 + 867 = 278307
Step 322: 278307 + 867 = 279174
Step 323: 279174 + 867 = 280041
Step 324: 280041 + 867 = 280908
Step 325: 280908 + 867 = 281775
Step 326: 281775 + 867 = 282642
Step 327: 282642 + 867 = 283509
Step 328: 283509 + 867 = 284376
Step 329: 284376 + 867 = 285243
Step 330: 285243 + 867 = 286110
Step 331: 286110 + 867 = 286977

So, 867*331 = 286977